Guard for power-driven wood-jointers.



'No. 692,748. Patented Feb; 4, I902. 4 v I A. .1. WHITE. -v

GUARD FUR POWER DRIVEN WOOD JUINTERS.

(Aiuplicatioi: filed Apr. 18, 1901.)

(No Model.)

I \\\\@&w--' Fly. 4.

Wfiness e s:

ATENT OFFICE,

ALFRED J. WHITE, OF AKRON,'OHIO.

GUARD FOR PO-WER'DRIVEN WOOD-JOINTERS.

SPECIFICATION forming part of Letters Patent .N 0. 692,748, dated February 4, 1902.

Application filed April 18, 1901. Serial No. 56,509. (No model.)

To all whom, it may concern:

Be it known that I, ALFRED J. WHITE, a citizen'of the United States,residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Improvement in Guards for Power-D riv'enWood- Jointers, of which the following is a specification.

My invention has relation to improvements in that class of power-driven woodworkingtools used to true the surfaces and edges of boards and the like and known as jointers.-

The kind to which this invention pertains consists of a metallic table with a transverse opening through which the knives of a rapidly-revolving cutter project from beneath and cut away and true up the under surface of boards and sticks fed along the face of the table by hand. In many instances operatives have pushed forward the stick'or board until their hands encountered the revolving knives, resulting in severe injuries, even to rendering amputation of the fingers necessary.

The object of my invention is to produce a guard that will not interfere with the passage of the board or stick but will arrest the hand of the operative and prevent it coming in contact with the knife.

To the accomplishment of this object my invention consists in the peculiar and novel construction, arrangement, and combination of parts hereinafter described, and then specifically pointed out in the claims, reference being had to the accompanying drawings,

which form a part of this specification.

In the accompanying drawings, in which similar referencenumerals indicate like parts in the difierent views, Figure 1 is a plan of a portion of a jointer embodying my improved guard; Fig. 2, an elevation of the guard and revolving knife with so much of the jointer in section at the line w of Fig. 1 as is necessary to show the relation of the guards thereto Fig. 3, an end View of the guard and portion of the. jointer looking from the left of Fig 2, and Fig. at a cross-section of the guard-shoe.

Referring to the figures, 1 represents the jointer-table, and 2 parts of the supportingframe,on which are j ournal-boxes 3 4, in which is mounted the knife-shaft 5, provided with a driving-pulley 6 and the revoluble knife 7. In the top of the cap of the box 4 is an annular channel 8, and centrally within this channel is a screw-threaded bolt-hole to receive the end of a bolt 9.

Above the table 1 and knife 7 is a horizontal arm 10, which has at one end an integral standard 11, that has a fiat base to rest on the cap of the box 4, an annular flange to fit the channel 8, an enlarged portion semicircular on opposite sides to reinforce it to permit of an opening for the bolt 9, and an aperture 12 to permit the insertion of the bolt in the bolt-hole. In the base of the standard is a hole that registers with a corresponding opening in the cap of the box 4 when the arm 10 extends across the table 1, in which is fitted a detachable pin 13, to lock the arm against movement until desired. The arm 10 is enlarged in the center and toward each end by semicircular bosses 14, 15, and 16, respectively, each bored vertically to receive, severally, freely-sliding rods 17, 1S, and 19, the

lower ends of which are attached to the guardshoe 20. The upper end of the rod 17 is screwthreaded, on which is fitted a handnut 21, by which the amount of descent of the shoe 20 is limited and adjusted, and on the rods 18 19 are coiled springs 22 23, respectively, that constantly tend-to press the shoe down. I

Theshoe 20 consists of a bar equal in length to the arm 10, rounded on the bottom with edges extending laterally outward in each direction'and bears onthe end adjacent to the standard 11 a bracket 24, having a groove in its vertical face that fits and slides on the edge of the standard, and on the opposite end a bracket 25, that supports aguide-rod 26, that runs in a notch in the end of the arm 10.

' In operation the arm is rocked around over the knife and locked by means of the pin 13' and the shoe raised to the proper height for the material to be jointed by means of the nut 21. boards or sticks are fed under the shoe 20 to the knife, the shoe rising vertically to permit the thicker parts to pass, but constantly pressed down by the springs 22 23 upon the stick or board, so that the hand cannot pass The machine being in motion, the

under it, but will be arrested by the shoe. WVhen not in use, the arm 10 may be rocked around out of the way by removing the pin 13.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

l. A guard for power-driven wood-jointers consisting of a supporting-arm having an adjusting-rod bearing a shoe to overhang the knife, and guide-rods to steady said shoe and springs to press said shoe downward, substantially as shown and described.

2. A guard for power-driven wood-jointers consisting of a supporting-arm hinged at one end to swing over the knife and away therefrom, having an adjusting-rod bearing a shoe to overhangtheknife,andguide-rods to steady said shoe and springs to press said shoe downward, substantially as shown and described.

3. In a guard for power-driven wood-jointers, the combination of an L-shaped frame means for pivoting its shorter arm to the frame of the jointer at one side of the revolving knife, a vertically-slidable shoe depending from said frame having guides at both ends, springs to constantly press down said shoe, a threaded rod to limit the down ward motion of said shoe, and means to lock the rotation of said frame on its pivot, substantially as shown and described.

at. The combination in a wood-jointer having an opening surrounding a revoluble knife mounted on a shaft, of an L-shaped frame, means for attaching it to the table of said jointer at one side of said opening, comprising a bolt, a turn-table surrounding said bolt to guide said frame in its horizontal rotation, a lock consisting of a vertical pin arranged to pass through said frame and enter perforations in the top of said jointer, a suspended shoe below the frame of said guard normally pressed downward by springs, a threaded rod to limit the downward motion of said shoe, and guides at the end of said shoe to steady its vertical motion, substantially as shown and described.

In testimony that I claim the above I hereunto set my hand in the presence of two subscribing witnesses.

ALFRED J. \VIIITE.

In presence of O. P. HUMPHREY, O. E. HUMPHREY. 

